????? ??? POLYURETHANEACRYLATE Polyurethane diol solution average Mn ~320, 88 wt. % in H2O Polyurethane self-skinningover foam mixed component Polyurethane thickening agent N/A Polyurethane topcoat Polyurethane bumper Polyurethane additive Polyurethane anticorrosive coating Polyurethane anti-corrosion primer Polyurethane paint thinner Polyurethane coating curing accelerator Polyurethane bicycle seat Polyurethane styrofoam Polyurethane self-skinning handrail Silicone oil for flexible polyurethane foam plastic Polyurethane-polyvinyl chloride imitation leather